EP0111602A1
Expired / Lapsed
EP
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Packaging bags
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1982-12-16
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Granted: —
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Expires: 2002-12-16
Abstract
Abstract A packaging bag has an outer layer and an inner layer. The outer layer is a low density ethylene-based polymer or a mixture thereof with an ethylene-vinyl acetate copolymer. The inner layer is a mixture of a high density polyethylene and an ethylene-a-olefin copolymer. This packaging bag has excellent physical properties, e.g. tensile strength and impact resistance, and is suitable for use in the packaging of heavy materials, particularly by an automatic packaging technique.
Inventors
- 👤 Kenta Yaeo
- 👤 Shinji Kawamura
- 👤 Yoshiyuki Mihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:03
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2439/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
A packaging bag comprising an outer layer and an inner layer, characterised in that the outer layer is a low density ethylene-based polymer or a mixture thereof with an ethylene-vinyl acetate copolymer, and the inner layer is a mixture of a high density polyethylene and an ethylene-a-olefin.
Claim 2
Dependent Claim
47 words
A packaging bag comprising an outer layer and an inner layer, characterised in that the outer layer is a low density ethylene-based polymer or a mixture thereof with an ethylene-vinyl acetate copolymer, and the inner layer is a mixture of a high density polyethylene and an ethylene-a-olefin.
Claim 3
Dependent Claim
39 words
A bag according to claim 1 characterised in that the low density ethylene-based polymer has a density of from 0.91 to 0.94 gram per cubic centimeter and a melt index of from 0.3 to 10 grams per 10 minutes.
Claim 4
Dependent Claim
36 words
A bag according to claim 1 or claim 2 characterised in that the low density ethylene-based polymer is an ethylene homopolymer or a copolymer of ethylene and an α-olefin containing from 3 to 12 carbon atoms.
Claim 5
Dependent Claim
38 words
A bag according to any preceding claim characterised in that the outer layer comprises from 10 to 95% by weight of the low density ethylene-based polymer and from 90 to 5% by weight of the ethylene-vinyl acetate copolymer.
Claim 6
Dependent Claim
39 words
A bag according to any preceding claim characterised in that the high density polyethylene has a density of from 0.94 to 0.97 gram per cubic centimeter and a melt index of from 0.01 to 1 gram per 10 minutes.
Claim 7
Dependent Claim
22 words
6, A bag according to any preceding claim characterised in that the ethylene-a-olefin copolymer of the inner layer is an ethylene-propylene-based elastomer.
Claim 8
Dependent Claim
36 words
A bag according to any preceding claim characterised in that the inner layer comprises from 95 to 50% by weight of the high density polyethylene and from 5 to 50% by weight of the ethylene-a-olefin copolymer.
Claim 9
Dependent Claim
27 words
A bag according to any preceding claim characterised in that the ratio in thickness of the outer layer to the inner layer is from 1/99 to 60/40.
Claim 10
Dependent Claim
24 words
A bag according to any preceding claim characterised in that the bag further comprises an intermediate plastics layer between the inner and outer layers.
Claim 11
Dependent Claim
33 words
A bag according to any of claims 1 to 8 characterised in that the bag further comprises an innermost plastics layer on the face of the inner layer opposite to the outer layer.
References Cited (Backward Citations)
US2956723A
Cited
GB1370355A
Cited
GB1368634A
Cited
GB2028716A
Cited
GB2037660A
Cited
EP0069526A1
Cited
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